package com.nebula.salary.common.utils;

import java.security.MessageDigest;

/**
 * MD5加密
 *
 * @author codex
 * @since 2022-03-20
 */
@SuppressWarnings("all")
public class MD5Util {
    private static String byteArrayToHexString(byte b[]) {
        StringBuilder resultSb = new StringBuilder();
        for (byte value : b) {
            resultSb.append(byteToHexString(value));
        }
        
        return resultSb.toString();
    }
    
    private static String byteToHexString(byte b) {
        int n = b;
        if (n < 0) {
            n += 256;
        }
        int d1 = n / 16;
        int d2 = n % 16;
        return hexDigits[d1] + hexDigits[d2];
    }
    
    /**
     * 返回大写MD5
     *
     * @param origin
     * @param charsetname
     * @return
     */
    private static String MD5Encode(String origin, String charsetname) {
        String resultString = null;
        try {
            resultString = new String(origin);
            MessageDigest md = MessageDigest.getInstance("MD5");
            if (charsetname == null || "".equals(charsetname)) {
                resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
            } else {
                resultString = byteArrayToHexString(md.digest(resultString.getBytes(charsetname)));
            }
        } catch (Exception exception) {
        }
        return resultString.toUpperCase();
    }
    
    public static String MD5EncodeUtf8(String origin) {
        origin = origin + "chenxinsdafaqj23ou89ZXcj@#$@#$#@KJdjklj;D../dSF.,ccccxnebula";
        return MD5Encode(origin, "utf-8");
    }
    
    private static final String hexDigits[] = {"0", "1", "2", "3", "4", "5",
            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
}
